CN213249618U

CN213249618U - Fibula bone fracture plate

Info

Publication number: CN213249618U
Application number: CN202021394782.9U
Authority: CN
Inventors: 冯炯; 包娟娟
Original assignee: Beijing Montagne Medical Device Co Ltd
Current assignee: Beijing Montagne Medical Device Co Ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2021-05-25
Anticipated expiration: 2030-07-15

Abstract

The present invention relates to a fibula bone plate for implantation in a human body to fix a fractured fibula, which is defined in a thickness direction by a lower surface intended to abut against a surface of the fibula and an upper surface opposite to the lower surface, and includes a distal end portion and a proximal end portion separated along a length direction and a rod portion connecting the two, wherein a locking nail hole extending from the upper surface to the lower surface and having a thread is provided in the distal end portion and the rod portion, wherein the thread of the locking nail hole is a two-line or more thread; and at least two locking nail holes are provided in the distal end portion, wherein projections of respective axes of the at least two locking nail holes in a plane perpendicular to the thickness direction intersect with each other. Therefore, the fibula bone fracture plate can effectively and reliably fix the fibula.

Description

Fibula bone fracture plate

Technical Field

The utility model relates to an orthopedics medical instrument field, more specifically relates to a fibula coaptation board.

Background

Tibia and fibula diaphysis fracture accounts for about 13.7% of the total fracture, mainly fracture of bones caused by violence or accidents, and injury of other parts such as blood vessels, tendons and nerves is often accompanied after fracture, so that timely and effective fixation is needed due to large activity of four limbs so as to avoid secondary injury. With the development of medical level and technology, most fractures can be effectively reduced, and the functions of limbs can be recovered as much as possible. However, studies have shown that the fibula fracture treatment device in the prior art may still cause a condition that a part of patients in clinic have bone nonunion and thus need to be treated again, which not only increases physical pain of the patients, but also increases mental stress and economic expenditure of the patients.

Therefore, there is a need in the art for a fibula fracture treatment instrument that can adapt to fibula structures of different patients, facilitate temporary fixation of a bone plate in an operation, and facilitate final fixation of the bone plate at a fracture site so as to achieve a better internal fixation effect.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problems in the prior art, the present invention provides a fibula bone plate for implantation in a human body to fix a fractured fibula, which is defined in a thickness direction by a lower surface intended to abut against a surface of the fibula and an upper surface opposite to the lower surface, and includes a distal end portion and a proximal end portion separated in a length direction and a rod portion connecting the two, wherein,

a locking nail hole extending from the upper surface to the lower surface and having a thread is provided in the distal end portion and the shaft portion, wherein,

the threads of the locking nail hole are two or more threads; and is

At least two locking pin holes are provided in the distal end portion, wherein projections of respective axes of the at least two locking pin holes in a plane perpendicular to the thickness direction are at an angle to each other.

Optionally, the threads of the locking nail hole are triple threads.

Optionally, at least three locking pin holes are provided in the distal end portion, and projections of respective axes of the at least three locking pin holes in a plane perpendicular to the thickness direction are at an angle to each other.

Optionally, the lower surface is contoured so that it can conform to the surface of the fibula.

Optionally, the proximal portion has a tapered shape.

Optionally, a pressing nail hole extending from the upper surface to the lower surface and having a smooth side wall is further provided in the rod portion.

Optionally, a plurality of locking nail holes and pressing nail holes alternately arranged along the length direction are provided in the rod portion.

Optionally, the fibula bone plate is further provided with kirschner wire holes extending from the upper surface to the lower surface.

Optionally, the fibula plate has a maximum width at the distal end, and the maximum width is in the range of 15-25 mm.

Optionally, the fibula bone plate is made of titanium and/or a titanium alloy.

The invention may be embodied as exemplary embodiments in the drawings. It is to be noted, however, that the drawings are designed solely for purposes of illustration and that any changes which come within the teachings of the invention are intended to be embraced therein and are limited only by the scope of the invention as defined in the appended claims.

Drawings

The drawings illustrate exemplary embodiments of the invention. These drawings should not be construed as necessarily limiting the scope of the invention. Like numbers and/or like reference numerals may refer to like and/or like elements throughout. In the various drawings:

fig. 1 is a schematic front view of a fibula bone plate according to the present invention;

fig. 2 is a schematic side view of a fibula bone plate according to the present invention; and

fig. 3 is a schematic perspective view of a fibula bone plate according to the present invention.

Detailed Description

The invention will now be described in more detail with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as necessarily limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided only to illustrate the present invention and to convey the concept of the invention to those skilled in the art.

As used herein, the terms "proximal" and "distal" are defined with respect to the torso of a patient at the time of implantation surgery, with the term "proximal" being the end closer to the torso and the term "distal" being the end farther from the torso, with reference to the human body and the components described herein that are intended to be implanted in the human body. In addition, in the respective drawings, the length direction is indicated by an arrow LL', which is equivalent to the proximal and distal direction with respect to the trunk of the patient in a state where the present fibula bone plate is fixed to the fibula of the patient; the thickness direction is indicated by an arrow TT', which is equivalent to the distal-proximal direction with respect to the fibula of the patient in a state where the present fibula bone plate is fixed to the fibula of the patient; the width direction is indicated by an arrow WW ', and the width direction TT' is equivalent to the radial direction of the patient's fibula and/or the direction perpendicular to both the length direction LL' and the thickness direction TT 'in a state where the present fibula bone plate is fixed to the patient's fibula. It is to be noted, however, that the above definition of relative orientation is given only for the purpose of better illustrating the technical solution of the present invention through the accompanying drawings, which should not be construed as limiting the scope of protection of the present invention in any way.

As described above, the fibula shaft fracture is mainly a fracture of a bone caused by violence or an accident, and the fracture is often accompanied by damage to other parts such as blood vessels, tendons, and nerves, and therefore, in order to avoid secondary injury, it is necessary to fix the fractured fibula in time and efficiently. Therefore, the utility model provides a fibula coaptation board, fibula coaptation board is used for implanting patient's internal and fix the fibula that takes place the fracture. Referring to fig. 1 to 3, there is shown a fibula bone plate according to the present invention, which is defined by an upper surface 110 and a lower surface 120 in a thickness direction TT', wherein the lower surface 120 is contoured so as to be able to conform to the surface of the fibula, whereby a foreign body sensation after the fibula bone plate is implanted into a human body can be reduced. Further, the fibula plate generally includes a distal portion 210 and a proximal portion 230 separated along a length direction LL' and a shaft portion 220 connecting the distal portion 210 and the proximal portion 230.

In particular, the distal portion 210 is intended to be fixed to the lateral malleolus of the fibula. To this end, as shown, a locking nail hole 510 extending from the upper surface 110 to the lower surface 120 and having threads is provided in the distal end portion 210, and by screwing a locking screw 610 (shown in fig. 3) into the locking nail hole 510 from one side of the upper surface 110 so that the threads of the locking screw (i.e., bone screw) 610 engage with the threads of the locking nail hole 510 and further rotating the locking screw 610 with respect to the locking nail hole 510, the locking screw 610 will advance along the axis of the locking nail hole 510 and be screwed into the lateral malleolus of the fibula, whereby the locking screw 610 will fix the distal end portion 210 to the lateral malleolus of the fibula.

The shaft portion 220 extends along a length direction LL' to connect the distal end portion 210 to the proximal end portion 230 and is intended to be fixed to the shaft of the fibula. To this end, as shown, a locking pin hole 510 is also provided in the stem portion 210. As described above, by screwing the locking screw 610 into the locking screw hole 510 from the side of the upper surface 110 such that the thread of the locking screw 610 engages with the thread of the locking screw hole 510 and further rotating the locking screw 610 relative to the locking screw hole 510, the locking screw 610 will advance along the axis of the locking screw hole 510 and be screwed into the fibula shaft, whereby the locking screw 610 will fix the shaft portion 220 on the fibula shaft. It is worth mentioning that in some cases of severe fractures, a free bone block may be present which is detached from the shaft of the fibula, and in order to fix such a free bone block, a locking screw 610 may be screwed into the free bone block through the locking screw hole 510, thereby fixing the free bone block to the fibula bone plate. Therefore, in order to be able to fix a plurality of free bone pieces, a plurality of locking nail holes 510 may be provided in the shaft portion 220.

The proximal portion 230 is intended to be inserted into the patient prior to the shaft portion 220 and the distal portion 210. In other words, an operator (e.g., a surgeon) first inserts the proximal portion 230 into the patient through an incision made in the skin surface of the patient, and then further inserts the shaft portion 220 and the distal portion 210 into the patient through the incision. Thus, the proximal portion 230 acts as a guide for inserting the fibula plate into the patient. In particular, the proximal portion 230 has a tapered shape, for example, a conical shape, a bullet nose shape, or the like, thereby enabling the fibula bone plate to be inserted into the patient through a small incision in the patient's skin more smoothly and easily through the distal portion 210, thereby enabling the surgical operation to be performed more smoothly.

Having described the general structure of the fibula bone plate according to the present invention, it can be seen from the above that the distal end portion 210 of the fibula bone plate is intended to be fixed to the lateral malleolus of the fibula, while the stem portion 220 of the fibula bone plate is intended to be fixed to the shaft of the fibula. Further, since fractures of the fibula occur mostly at the relatively weak diaphysis rather than the relatively strong lateral malleolus, the distal portion 210 serves primarily to fix and/or position the fibula plate, while the shaft portion 220 serves primarily to fix and/or position the fractured bone piece. Thus, in use, an operator (e.g., a surgeon) first makes an incision in the patient's skin, then inserts the proximal end portion 230 of the fibula bone plate into the patient's body through the incision, and further inserts the shaft portion 220 and the distal end portion 210 thereof into the patient's body. After insertion is complete, the distal portion 210 is first secured to the lateral malleolus with locking screws 610 to secure the fibula plate. After the fixation of the fibula plate is completed, the shaft 220 and the fibular stem (including free bone pieces) are fixed to each other using the locking screw 610. In this way, the fibula is fixed by the fibula bone fracture plate, and the fibula can be further smoothly healed.

As can be seen from the above, since the distal end portion 210 mainly functions to fix and/or position the fibula plate, whether the distal end portion 210 can be reliably positioned on the lateral malleolus of the fibula directly determines whether the fibula plate can successfully fix the fibula. Therefore, as shown in fig. 1 to 3, at least two locking nail holes 510 may be provided in the distal end portion 210, and the at least two locking nail holes 510 may be arranged such that the extension/straight line on which the projection of their axes in the plane defined by the length direction LL ' and the width direction WW ' (i.e., the plane perpendicular to the thickness direction TT ') intersects with each other, in other words, is at an angle (non-zero angle) to each other. According to this aspect, after the distal end portion 210 is fixed to the lateral malleolus of the fibula, the movement of the fibula plate in the thickness direction TT' will be restricted by the axial force of the locking screw 610. Further, since the extension lines/the straight lines on which the projection of the axes of the at least two locking nail holes 510 in the plane defined by the length direction LL 'and the width direction WW' intersect each other, there is no direction in the plane while being perpendicular to each axis of the at least two locking nail holes 510, which allows the motion of the fibula plate in any direction in the plane to be restricted by the axial force (tensile force) of the at least one locking screw 610, but not restricted only by the radial force (shear force) of the locking screw 610. More intuitively, each axis of the at least two locking pin holes 510 will extend in a different direction in a three-dimensional configuration, rather than being defined in a plane. Therefore, according to this aspect, the movement of the fibula plate in either the thickness direction TT 'or the direction perpendicular to the thickness direction TT' is restricted by the axial force of the locking screw 610, and the locking screw 610 can apply the axial force more reliably than the radial force, and therefore, the distal end portion 210 can be reliably positioned on the lateral malleolus of the fibula, thereby ensuring that the subsequent fixation of the stem portion 220 to the fibula shaft can be performed smoothly.

Further, at least three locking nail holes 510 may be provided in the distal end portion 210, and straight lines on which extensions/projections of the axes of the at least three locking nail holes 510 in a plane perpendicular to the thickness direction TT' intersect with each other, in other words, at an angle (non-zero angle) to each other. Thus, with reference to the above description, the axes of the at least three locking nail holes 510 will extend in different directions in a three-dimensional structure, rather than being all defined in a plane, which enables the distal end portion 210 to be more reliably positioned on the lateral malleolus of the fibula.

Further, as described above, the locking screw 610 is driven into the fibula by being rotated with respect to the locking nail hole 510, and thus, as shown in fig. 1, the locking nail hole 510 is provided with two or more threads, for example, a three-thread, a four-thread, and the like. In this manner, the lead of the locking pin bore 510 will be twice or more the pitch. This allows the locking screw 610 head to be screwed into the bone plate at two or more times the speed of the locking screw head compared to a single thread, and by increasing the speed of the locking screw head screwing into the steel plate through multiple threads, the speed of the head threading into the bone plate can be made to substantially match the speed of the body threading into the fibula, thereby preventing the screw from stressing during screwing.

Optionally, as shown, a press stud hole 520 extending from the upper surface 110 to the lower surface 120 is further provided in the stem 220, the press stud hole 520 having smooth sidewalls. Thus, a compression screw (not shown) may be threaded through the compression screw hole 520 into the fibula shaft, thereby pressing the stem 220 against the fibula shaft. In this way, the lower surface 120 can be ensured to be attached to the surface of the fibula, thereby reducing the foreign body sensation generated after the fibula bone plate is inserted into the human body. In use, after the distal end portion 210 is fixed to the lateral malleolus of the fibula, the shaft portion 220 may be fitted to the shaft of the fibula using the compression screw, and then the fracture and/or the free bone fragment may be fixed using the locking screw 610, in such a manner that not only is it ensured that the fracture and/or the free bone fragment may be smoothly fixed using the locking screw 610, but also the foreign body sensation generated after the fibula bone plate is inserted into the human body may be reduced.

Further alternatively, as shown in fig. 1, a plurality of locking nail holes 510 and pressing nail holes 520 alternately arranged along the length direction LL' are provided in the rod portion 220.

Alternatively, in order to temporarily fix the fibula first using a k-wire before formally fixing the fibula using the locking screw 610, the fibula bone plate further has a k-wire hole 530 extending from the upper surface 110 to the lower surface 120, as shown in fig. 1. Thus, before the fibula bone plate and the fibula are fixed to each other by the locking screw 610, a k-wire (not shown) may be inserted into the fibula through the k-wire hole 530 to temporarily fix the fibula, thereby enabling a subsequent formal fixing operation to be performed more smoothly.

Optionally, as shown in fig. 1, the fibula plate has a maximum width W at the distal end 210_maxAnd the maximum width W_maxIn the range of 15-25 mm. When the maximum width W of the fibula bone fracture plate_maxLess than 15mm, the fibula bone-knitting plate is too small in size to effectively fix the fibula; when the maximum width W of the fibula bone fracture plate_maxWhen the diameter is larger than 25mm, the size of the fibula bone-knitting plate is too large, so that a patient can have a strong foreign body feeling after implantation; thus by setting the maximum width W of the fibula plate_maxThe fixing device is arranged in the range of 15-25mm, so that the fibula can be effectively fixed, and foreign body sensation generated after the fixing device is implanted into a human body can be reduced.

Optionally, the fibula plate is made of titanium and/or a titanium alloy, and the locking screw 610 is also made of a titanium alloy. In this way, both the fibula plate and the locking screw 610 have better biocompatibility and have a lower modulus of elasticity. In particular, the locking screw 610 may also be made of a CoCrMo (cobalt chromium molybdenum) alloy. Thus, the hardness of the fibula plate will be much lower than the hardness of the locking screw 610, which allows the locking screw 610 to rotate within an angular range of at least 30 ° relative to the fibula plate (as indicated by angle α in fig. 3) during engagement of the locking screw 610 with the locking screw hole 510, at which point the locking screw 610 may be referred to as a gimbaled screw. This is particularly advantageous in the case of free bone pieces in the fibula that are inaccessible when the locking screw 610 is advanced along the axis of the locking nail hole 510, because when such free bone pieces are present, the operator (e.g., a surgeon) can rotate the locking screw 610 relative to the fibula plate to thread the locking screw 610 into the free bone piece for better fracture end reduction and fixation.

A preferred but non-limiting embodiment of a fibula bone plate according to the invention is described in detail above with the aid of the accompanying drawings. Modifications and additions to the techniques and structures, without departing from the scope and spirit of the disclosure as set forth in the following claims, are deemed to be within the scope of the invention. Accordingly, such modifications and additions as may be contemplated under the teachings of the present invention are intended to be part of this disclosure. The scope of the present disclosure is defined by the following appended claims, and includes equivalents known at the time of filing this disclosure and equivalents not yet foreseen.

Claims

1. Fibula osteosynthesis plate for implantation in the human body for the fixation of a fractured fibula, which is defined in the thickness direction (TT ') by a lower surface (120) intended to abut against a fibula surface and an upper surface (110) opposite to said lower surface (120), and comprises a distal portion (210) and a proximal portion (230) separated along the length direction (LL') and a stem portion (220) connecting the two, wherein,

a locking screw hole (510) extending from the upper surface (110) to the lower surface (120) and having a thread is provided in the distal end portion (210) and the shaft portion (220), characterized in that,

the threads of the locking nail hole (510) are two or more threads; and is

At least two locking nail holes (510) are provided in the distal end portion (210), wherein projections of respective axes of the at least two locking nail holes (510) in a plane perpendicular to the thickness direction (TT') are at an angle to each other.

2. The fibula plate of claim 1, wherein the threads of the locking nail hole (510) are triple threads.

3. The fibula plate according to claim 1, characterized in that at least three locking nail holes (510) are provided in the distal end portion (210), and projections of respective axes of the at least three locking nail holes (510) in a plane perpendicular to the thickness direction (TT') are at an angle to each other.

4. The fibula plate of any one of claims 1 to 3, wherein the lower surface (120) is contoured to enable it to conform to a fibula surface.

5. The fibula plate according to any one of claims 1 to 3, characterized in that the proximal portion (230) has a tapered shape.

6. The fibula plate according to any one of claims 1 to 3, wherein a pressure nail hole (520) extending from the upper surface (110) to the lower surface (120) and having a smooth sidewall is further provided in the shaft portion (220).

7. The fibula plate according to claim 6, wherein a plurality of locking nail holes (510) and pressurizing nail holes (520) alternately arranged in the length direction (LL') are provided in the shaft portion (220).

8. The fibula plate according to any one of claims 1 to 3, characterized in that it is further provided with Kirschner wire holes (530) extending from the upper surface (110) to the lower surface (120).

9. The fibula plate according to any one of claims 1 to 3, characterized in that it has a maximum width (Wmax) at the distal end (210)_max) And the maximum width (W)_max) In the range of 15-25 mm.

10. The fibula plate of any one of claims 1 to 3, wherein the fibula plate is made of titanium and/or a titanium alloy.